I can try to dig up a couple shots-they won't be real closeup per say. My early amps had the chassis and heatsinks made out of old road signs, that I cut and formed. Nothing fancy on the amps- a couple of volume knobs-an on/off switch and light. Plain flat front panel. On the back was the input fuse (the seperate PS fuses for each channel were on the inside so that if 1 channel went belly up- the other kept on working) input and output jacks and a parallel drive switch. The Eq's and crossovers the same type of thing, were just plain panels with rotary knobs- (it was to hard for me to cut slots and mount sliders).
I had more time than money back then, but I did alot of gigs on the all homemade PA. When you have nothing-you really learn how to get the most out of it.